The URL is unique for each of our clients and the main difference in the URL's is the shortname. The shortname is an acronym that we use for your organization. The URL will also depend on which server your site is on (2 or 3). Here are the URL's for each server:

https://secure2.convio.net/(shortname)/admin/AdminLogin

OR

https://secure3.convio.net/(shortname)/admin/AdminLogin

Replace (shortname) with YOUR organization's shortname. If you do not know your shortname, then please Contact Support and reference this article.